Lyot星冕仪光学系统及杂散光抑制  

Optical system and stray light suppression of Lyot coronagraph

作　　者：迟金鹏 张红鑫[1] 王晓东[1] 孟庆宇[1] 秦子长 李云辉[1] 王泰升[1] 李凤有[1] CHI Jinpeng;ZHANG Hongxin;WANG Xiaodong;MENG Qingyu;QIN Zichang;LI Yunhui;WANG Taisheng;Li Fengyou(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《光学精密工程》2022年第17期2050-2057,共8页Optics and Precision Engineering

基　　金：中国科学院战略性先导科技专项(A类)资助(No.XDA17010205)。

摘　　要：木卫一等离子体环是木星磁层中密度最大、研究最广泛的区域。为满足木卫一等离子体环的观测需求,设计了一种用于行星大气光谱望远镜(Planetary Atmospheric Spectral telescope,PAST)的Lyot星冕仪。根据木星的辐射特性与PAST参数确定仪器参数,给出Lyot星冕仪的初始结构并进行优化;分析了Lyot星冕仪的成像性能,系统在37 lp/mm的MTF>0.6,满足成像质量要求;确定系统杂散光成因,利用物像共轭关系设计相应的杂散光抑制结构,在千级超净间对Lyot星冕仪进行杂散光抑制水平检测。实验结果表明:系统主要杂散光得到了有效抑制,系统的杂散光抑制水平在2.5Rj处为10-5量级,满足地基观测木卫一等离子体环要求。The Io plasma torus is the most densest and most widely studied region of Jupiter′s magnetosphere.To meet observe the Io plasma torus observation,a Lyot Coronagraph was installed in the planet′s atmosphere spectrum telescope to meet the needs of imaging observation of Io plasma torus capture the emissive spectrum.The parameters of the instrument were determined according to the radiation characteristics of the Jupiter and the parameters of PAST.Then,the initial structure was optimized.The imaging performance of the system was analyzed,and the MTF value at37 lp/mm is above 0.6 that meet the design specification.Considering the character of stray light in system,a structure system for suppressing stray light was built considering the characteristics of stray light.The level of stray light in the system was measured in a class 1000 cleanroom.The experimental results show that the main sources of stray light can be suppressed entirely,and the stray light suppression level of the system is equal to 10-5at 2.5Rj,which satisfies the system requirements for observing Io plasma torus.

关 键 词：光学设计 光学遥感 天文仪器 星冕仪 杂散光 

分 类 号：TH753.12[机械工程—仪器科学与技术]